Paper-stock strainer



Nov. 27, 1928. 1,693,560

J. D. HASKELL. ET AL PAPER STOCK STRAINER Filed Dec. 1924 2 Sheets-Sheetl Nov. 27, 1928. 1,693,560

J. D. HASKELL ET AL PAPER STOCK STRAINER Filed Dec. 1924 2 Sheets-Sheet2 W WW Y 2 Patented Nov. 27, 1928;

ET I 3' JOHN D. HASKELL AND MORTIMER R. RUST, OF FULTON, NEW YORK,ASSIGNORS TO DILTS MACHINE WORKS INCORPORATED, OF FULTON, NEVT YORK, ACORPORA- PAPER-STOCK S'IRAI'NER.

Application filed December 8, 1924. Serial No. 754,626.

This invention relates to a paper stock strainer, technically known as acylinder washer of the siphon-type for-beating engines involving the useof a vat or tub in 5 which'the mixture of stock and water is circulatedby the rotation of the beater roll or any other suitable circulatingmeans for agitating and reducing the stock to the required consistencyfor manufacturing into paper.

During this agitation and circulation a considerable quantity of dirtand other impurities are liberated from the stock'and held in more orless suspension in the water and one of the main objects of the presentinvention is to provide a more eficient and eXpedi-- tious means forremoving these impurities while the fresh, pure water is being added tothe mass in circulation and thereby to accelcrate the washing orcleansing of the stock from such dirt or other impurities.

In other words we have sought to carry out this object bymeans of arotary screen drum supported in such manner that agreater or less areaof its screened perimeter will project into the vat in the path ofmovement of the circulating stock to be automatically rotated therebyfor successively presenting different portions of the screen in saidpath and at the same time to'cause the dirty or impure water passingthrough and to the interior of the screen to be automatically withdrawn, preferably by siphon action, as it accumulates therein, whilefresh water is being supplied to the vat to replace the impure water asthe latter is withdrawn.

Another object is to utilize the flow of fresh water to the vat or tubfor starting or assisting the siphoning action. f j

A further object is to provide 'means whereby the conduits through whichthe impure water is withdrawn may be easily and quickly cleansed whennecessary or desirable.

Other objects and uses regulating to specific parts of the washingapparatus will be brought out in the followingjdescription.

In the drawings: V Figure 1 isa top plan of a portion of a tub or vat inwhich the stock is circulated together with the rotary screen and amovable support therefor in operative position.

Figure ,2 is a side elevation of the parts shown in Figure 1 except thata portion of the vat or tub is broken away to show the portion of therotary screen projecting therein. a

Figure 3 is an enlarged, longitudinal, vertical, sectional VlGW, partlybroken away, of portions of the vat and screen and the adjacent portionsof the movable supporting frame for the screen together with the meansfor inducing the siphoning action of the impure water from within thescreen.

Figure 4 is an enlarged detailed sectional view of a portion of one endof the rotary screen showing the manner of fastening the peripheralscreen to the end heads and connecting bars. J

In order that the invention may be more clearly understood we have showna portion of a vat or tub -'1 as provided with a lengthwise trough orchannel -2 through which the mixture of water and stock is adapted to becirculated in the direction in dicated by arrow -a by any suitablecirculating means as, for example, by the roll of a beater engine, notshown, whereby the stock is agitated and reduced more or less to thedesired consistency for manufacture into paper.

A screen drum 3 which, for convenience of description may be termed acylinder, is rotatably mounted upon a suitable support-- ing frame torevolve about a horizontal axis transversely of the channel 2'andextends axially a distance corresponding approximately to the width ofsaid channel with which it is registered and into which the lower sideofthe cylinder is adapted to project when adjusted for use.

The frame --4 upon which the screen cylinder 3' is mounted is adjustablever tically for-moving the cylinder into and out of the vat and also forvarying the depth of immersion of the lower side thereof into thecirculating stock in the channel --2, said frame consisting in thisinstance of opposite end bars '5 extending diametrically acrosscorresponding ends of the cylinder 3 and beyond diametrically oppositesides thereof and having one end thereof pivoted while the other ends ofthe bars 5 are connected to each other by cross bar to which isconnected a hoisting cable 8- adapted to be connected to any suit-ablehoisting mechanism, not shown, whereby the frame 4 with the screencylinder 3 thereon may be rocked about the axis of the bearings 3- tovary the depth of immersion of the lower side of the screen in theliquid stock or by the same hoisting means the screen cylinder may belifted entirely out of the vat if desired.

The screen cylinder 3 comprises a pair of similar, coaxial end heads 9-arranged in axially spaced relation concentric with the axis ofrevolution and provided with central hubs 10- which are j ournalled bymeans of anti-friction roller bearings 1l upon relatively stationaryjournal bearings -12 on the central portions of the arms 5 of the framek so that the screen cylinder +3,as a whole, may revolve freely uponsaid frame.

' These end heads 9- are provided with a plurality of similar openings13 of relatively large area arranged in uniformly spaced relation,circumferentially about the axis of rotation and are covered by screenedpanels or discs 1l which are preferably secured to the inner faces ofthe heads by screws or equivalent fastenin means so as to form unitaryparts of said heads.

The perimeters of the heads 9 are similarly serrated, the serrationsbeing rela tively large or elongated circumferentially to form a seriesof teeth -1'" and depressions 16, the teeth -15- of each head beingarranged in uniformly spaced relation circumferentially and in axialalignment with the teeth of the other head. The edges of the teeth,facing in a direction opposite the direction of rotation of the c linder-3, are abruptly inclined slight angle to the radial lines passingthrough the points of the teeth at the side of said radial linesopposite the direction of rotation and are tangential to circles ofrelatively small radlus while the other edges of the teeth are inclined.

at a much greater angle to said radial lines and are, therefore,tangential to circles of relatively large radius, the joining portionsof the long edge of each tooth with the shorter edges of the nextadjacent teeth being rounded at.-16-- to form the depressions previouslymentioned and for a purpose hereinafter described in connection with theperipheral screen.

The points of corresponding teeth of the opposite heads -9- areconnected by rigid bars 17 which are secured to the heads by screws 17or equivalent fastening means so that the outer faces of the bars aresubstantially coincident with the corresponding points of the teeth.

A peripheral screen -18 1s wrapped tightly around and against theperipheral edges of the teeth 15- and are rigidly secured thereto byscrews or otherwise to form a unitary part thereof, and to conform tothe circumferential outlineof the periphcries of the heads 9-.

That is, the ends of the screen 18 follow the peripheral contours of theheads -9 and are supportedintermediate the heads by the lengthwise bars-17- to which they are secured by clamping bars 19- which, in turn, aresecured to the bars 17 by screws -20 or equivalent fastening means. 1 7

It is now clear that when the peripheral I screen .18. is wrapped aroundthe peripheral edges of the heads 9 and bars 17 so as to follow thecontour of the teeth -l5- it will form a circumferentially corrugatedperimeter, and the portions thereof which arefastened to the abruptedges of the teeth will constitute impact faces 21-- which whenprojected into the path of movement of the circulating stock in the vat-1 receive the impact of the moving stoclr as the latter travels throughthe channel 2 thereby causing automatic rotation of the screen cylinder.7

The corrugating of the screen perimetric of the drum in the mannerdescribed produces a series of parallel lengthwise ribs in uni.- formlyspaced relation circumferentially, in which the opposite faces of eachrib are dis posed at different angles r latively to a radial planepassing through the center of said rib and those having the lesser anglewill face in the same direction circumferentially to form the impactfaces previously,described.

The frame a is hung in such manner upon the tub or vat -1 as to swing toa substantial horizontal position close to the all of which greatlyincreases the washing efficiency of the apparatus and also greatlyexpedites the washing operationand enables the fresh water to take theplace of the impure water practically as fast as it is removed by thesiphon action and therefore the stock is practically clean after leavingthe'washing cylinder. v

It will, of course, be understood that any number of these cylinders maybe employed to ope "ate in succession along the line of tally throughcentral openings inthe end v i flz'p'hon action. 7 A siphon pipe -22 isextended horizonheads 9 of the cylinder 3 and also through alignedopenings in the bearings 12 co-axial with the axis of revolution of saidcylinder, one end of the siphon pipe 22 being closed by a cap nut 23while the otherendis connected by a T Coupling 24 to 'a radiallyextending branch pipe 25, the outer end of the T coupling '24- beingnormally closed bya plug 26 which maybe removed when necessary to allowa suitable cleaning tool to be passed entirely 7 connected toa Tcoupling -2 turn, 1s p1votally connected by a union vthrough the pipe 22for cleaning purposes. I Q g V The rear end of the branch pipe 25 iswhich, in

-28- and a nipple 28 to a d-way coupling 29--, the axis of the coupling28- and nipples 28 being co-axia-l with the axis of the pivots 6 of thescreensupporting frame 4 so as to allow said frame with the screencylinder thereon to rock vertically Without straining any oftheconnecting joints of the siphon system.

The portionof the horizontal siphon pipe 22 within the screen cylinder 3is provided with one or more T couplings 30 having a radial branchsiphon pipe 31 extending downwardly to a level near the lower side ofthe screen cylinder 3 but in spaced relation thereto and therefore somedistance below the level of the liquid stock in the vat --1 when theframe 4 with the screen thereon is adjusted for use so that any suitabledegree of suction temporarily created within the coupling 29 and siphonpipes -25 22 and 31 will induce an up-fiow of the dirty water within thescreen cylinder 8 through the pipes 31, 22- and 25- respectively andthence into the coupling 29 where it may be discharged to a waste pipeor other place of deposit outside of the vat -l. q

A' delivery pipe 32 is connected to the lower side of the coupling 29 toextend downwardly therefrom at the exterior of the vat and adapted to beconnectedto any suitable waste pipe, not shown;

In the use of this siphon principle of eduction of the dirty water fromthe interior of the screen, it is, of course, necessary, particularly instarting the siphoning action, to withdraw air from the siphon pipes andin- I asmuch as it is also necessary to supply fresh water to the vat toreplace the dirty water I as it is withdrawn the flow of the fresh waterto the vat through suitable pipes is utilized for that purpose.

1 That is, the water i from any available source of supply is conductedthrougha pipe 1 33 to one end of any suitable air eductor or exhauster34- having its other end provided with a discharge pipe 35- discharginginto the vat, the intermediate portion of said eductor being connectedby an air pipe 36 to the upper side of the coupling 29 so that the freshwater under pressure delivered through the eductor will withdraw the airfrom the siphon pipes 25-, 22' and 3land thereby induce the flow ofwater into said siphon pipes and thence out through the discharge pipe32- whereupon the flow of the dirty water from the interior of thescreen will continue under the well-known siphonic action. 7 r

The pipe r36'is provided with a valve 37- for controlling the suction inthe siphon system without in any way affecting the free flow of thefresh waterthrough the pipes 33 and 35 to the vat -1. s

The water supplyipipe 33 is also pro by the upward, rocking movement ofits supporting frame 4:-.

I Operation.

During the circulation of the liquid stock in the vat 1 along thechannel -2 the frame 4 with the screen cylinder thereon 'is lowered sothat the major portion of the lower half of the screen will be immersedin said stock with its impact faces 21 opposed to the direction of flowof said stock which, in turn, causes a rotary motion of the screencylinder 3-- in the direction indicated by'arrow g Figure 2- therebysuccessively presenting the impact faces to the flowing stock andcausing a self-cleansing of the peripheral screen 18 against clogging. I

This rotation of the screen cylinder in the liquidstock also causes thestock to be dis tributed more or less evenly over the screens 18 and 14and thereby causes a thorough washing of the same from dirt and otherimpurities and enables the dirty water to pass through the screens intothe interior of the cylinder where it is removed by suction through thepipes 31-, -22, and -25- and discharged to the exterior of the tankthrough the pipe 32.

justed to allow the air to be withdrawn -from the suction pipes of thesiphon system until the outflow of the dirty water through said pipesbegins, whereupon the valve 37- is adjusted to prevent further suctionof the air in the siphon system.

After these adjustments have been made the siphoning of the dirty waterfrom the interior of the screen and the supply of fresh Water to the vat1 to replace the dirty Water which is removed continues automaticallyfor an indefinite period of time without any further attention on thepart of the operator.

What we claim is i In a paper stoc; strainer, a vat having a channelthrough which the stock is caused to move in one direction, a framehingedly mounted on the vat to swing vertically about a horizontal axis,a screen drum journaied on the frame to rotate about an axis parallelwith and some distance from the axis of movement of said frame, saiddrum having its lower side immersed in and actuated by the flowingstock, a siphon pipe extending frame, an air exhauster connected to oneof the siphon pipes, and means for passing water through the exhausterand into the Vattor exhausting an from the siphon pipes suthcient tostart the siphoning of dirty water fromthe interior of the drum and forsupplying fresh water to the interior of the vat. e

In witness whereof we have hereunto set our hands this first day ofDecember, 192 i,

JOHN 1). HA 'KELL. Monininn a. Rust.

